Automatic chuck



H. WOLNICK AND R. HERVIG.

AUTOMATIC CHUCK.

APPLICATION HLED DEC. 29. 1 919.

Patented Oct. 17, 1922.

2 SHEETS-SHEET x if.' mv 2 l n J H. F. WOLNICK AND R. HERVIG.

AUTOMATIC CHUCK. APPLICATION FILED pI:c 29. I9I9.

1,412325225, Patented 0st. 17,' A922.

2 SHEETS-SHEET 2.

Patented il?, i922.

januar r. wonuicir .ann Brennan Hnavre, or onorario, ILLINOIS, assreivons 'ro Aiannrcaii can Ann :somvnnv coivrrANY, or sr. Louis, ivissounr, A eoarona- TION 0F NEVI JERSEY.

AUTOIVATC CHUCK.

Application led December 29, 1919.

T o all 'whom it may concern Be it known that we, HENRY F. VVOLNICK and RICHARD Hrnvio, residing at lhicagon, Cook County, Illinois, and being citizens or lthe United States, have invented certain new and useful improvements in Automatic Chucks, of which the following is a full, clear, and exact description, such as will enable others skilled in the art to which 1t appertains to make and 'to use the same, relierence being had to the accompanying draw-l ings, which illustrate the preferred term oiA the invention, though it is to be understood that the invention is not limited to the exact details oi construction shown and described, as it is obvious that various modifications thereof within the scope of the claims will occur to persons skilled in the art.

In said drawings: I

Figure 1 is a view, partly in elevation and partly in central vertical section, of our iinproved chuck, the end of a grooved shank drill being shown in position in the chuck.

Figure 2 is a view, partly in elevation and partly in central vertical section, the plane of the section being at right angles to the plane of the section of Fig. 1.

Figures 3, l, 5 and 6 are sections taken on lines 3 3, 4 4, 5 5 and 6 6, respectively of Fig. 1.

Figure Z is a section taken on line 6 6 of Fig. 1 with the chuck shown in the release position.

Figure 8 is a view in elevation of the chuck body, the'body being partly broken away so as to show the spring slot.

Figure 9 is a view in elevation of the jaw retainer of the chuck. y

Figure 10 is a view of the jaw retainer ot the chuck taken at right angles to Fig. 9, and Fig. 11 is a view of a modified form of the chuck adapted to be screwed onto the driving spindle.

lt is an object of our invention to provide an improved chuck `for holding groovedl shank twist drills of the type wherein the drill retaining jaws are forced to retaining position by cams as the chuck is moved to operative position and the jaws are spring operated to release position in the 1nopera tive position of the chuck, the earns being then so positioned as to release the jaws.

lt is also an object or our invention to provide an improved chuck that may be readily operated manually to the inoperative posi-= Serial No. 348,167.

tion and which will automatically return to the operative position when released in any other position.

With these and other objects in view our invention comprises, as shown in Figs. 1 and 2, a tapered stern 1, adapted to be inserted in the spindles of lathes or other machines in the place ot' the usual tapered stems of twist drills. rlhe stem 1 is provided with a head 2 having a flange 3, interiorly screw threaded, and a projection 4t provided with a tapered hole for the reception of the tapered end of the drill.

Screw threaded to the flange 3 is the sleeve 5, the outer :tace oit the sleeve being cylindrical while the opposite sides ot the inner face of the sleeve have the cam surfaces 6 and 7 shown in Figs. 3 to 7. Screw threaded to the outer end of the sleeve 5 is the cap 8.

l/Vithin the sleeve 5 and engaging cap 8 is the jaw retainer 9, shown separate in Figs. 9 and 10. The jaw retainer 9 lis substantially cylindrical in shape, and has a shoulder 10 at its lower end that engages the cap 8, recesses 11 and 12 to receive the springs that move the jaws to the release position, a groove 13, at the center' to receive the main operating spring, a pair of diametrically opposed slots 14- and 15 at each end to receive the projections the ends of the ljaws 16 and 1i and a screw threaded opening 4:8. The jaws 16 and 1T lie within the jaw retainer 9, and each has a body extending lengthwise of the jaw retainer and shaped to iit the grooves of the drill shank and at each end of the jaw body is a projection, as 27 and 28 in Fig. 2, rectangular in shape and extending at right angles to the jaw body through the recesses 14 and 15 of the retainer 9, the outer ends of the projections engaging with the cam faces 6 and 7. In the recesses 11 and 12 and engaging in openings in the ends oi' the jaws are springs 18 and 19 adapted to retract the jaws 16 and 17 when they are not forced inwardly by the earn surfaces 6 and 7. Lying in the groove 13 and having its ends engaging in the slot 2O in the jaw retainer 9 and in the slotI 21 in the sleeve 5 is a spiral spring 22, of several turns, that surrounds the aw retainer 9 and serves to maintain the jaw retainer 9 in such position, relative to the sleeve 5, that the cam surfaces 6 and 7 will be effective to force the jaws 16 and 17 inwardly to operative position. Surrounding the sleeve 5 and engaging the cap 8 and the flange 8 of the head 2 is a knurled sleeve 23. A pin 24, passes through an opening 25 in the knurled sleeve 23, through a slot 26 in the sleeve 5 and is secured in the screw threaded opening li8 in the jaw retainer 9.

To operate the device when it is mounted upon a lathe or other machine that will serve to hold the stem l, head 2 and sleeve 5 against rotation, the knurled sleeve is ro tated approximately a quarter-turn, and rotates the aw retainer 9 by means of pin 24, the pin 24 travelling freely in the slot 26 olL sleeve 5. This rotates the aw retainer 9 to "a position in which the projections 27 and 28 are oplposite the parts'oi' the cam faces that are furthest from the central axis o'l' the chuck, thus permitting the jaws 16 and 17 to loe retracted by the springs l8 and. 19 for the insertion or withdrawal of the drill, and tightens the windings of spring 22. Upon release of the knurled sleeve, the spring 22 rotates the jaw retainer 9 and knurledsleeve 23, and the cam faces 6 and 7 act upon the projections 27' and 28 and the jaws 16 and 17 are forced inwardly, against the action of springs i8 and 19, into tool engaging or normal position.

In the modification shown in Fig. ll, the head 2, instead of being attached to a tapered stem l as in Fig. l, is provided with an interiorly screw threaded flange 30 so that the chuck may be attached to the spindle of the lathe or other machine.

What we claim is: y l. A chuck comprising a head, a sleeve having cam :faces carried hy the head, a jaw retainer having slotted ends mounted. in said sleeve and rotatable with respect to said head, U-shaped jaws mounted in said slots in said aw retainer and having their ends engaging said cam faces and yielding means to cause said cani faces to operate said j aivs.

2. A chuck comprising a head, a sleeve carried hy said head, a jaw retainer having slotted ends in said sleeve, U-shaped jaws having their ends engaging in the slots in said jaw retainer, a cap carried by said sleeve and engaging said jaw retainer and means engaging said head and said cap for operating said jaw retainer.

3. A chuck comprising a head, a sleeve having cam Yfaces carried by said head, a jaw retainer having slotted ends in lsaid sleeve, U-shaped jaws carried said` jaw retainer and having their ends projecting through the slots in said jaw retainer and engaging said cam faces, a groove in said jaw retainer and a spring mounted in said. groove and adapted to hold vsaid sleeve and jaw retainer in normal relative positions.

4l. A chuck comprising a head, a sleeve carried by said head, a jaw retainer, slotted at its ends, within said sleeve, U-shaped jaws having their ends engaging in the slots in said jawretainer and a second sleeve surrounding said trst sleeve and adapted to operate said jaw retainer. y

5. A chuck comprising a head, a slotted sleeve carried by said head, a jaw retainer in said sleeve and having slotted ends and a circumferential groove between the slots, jaws having their ends in the slots in said retainer, a spring in said groeve and engaging said slotted sleeve and said jaw retainer, second sleeve surrounding said'slottedl sleeve and a connection between. said second sleeve and said jaw retainer extending through the slot in said first sleeve.

6. A chuck comprising a head,l a slotted sleeve carried by said head, a jaw retainer having slotted ends in said sleeve, U-shaped jai 7s having their ends engaging in the slots in said jaw retainer and contacting with said slotted sleeve, a second. sleeve surrounding said lirst sleeve and a connection between said jaw retainer and said second sleeve eX- tending through the slot in said first sleeve.

ln witness whereot1 we have hereunto set our hands in the presence of two witnesses.

HENRY F. WOLNICK.

. RICHARD HERVIG.

1Witnesses A. O. Birnen, A. T. HUGHES. 

